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3.6.2.4 Frequency offset
The Frequency offset applies to ALL of the simulated signals in the signal generator
mode, i.e. once you set an offset, the code phases of the simulated signals start to shift com-
pared to each other.
3.6.2.5 Start time
The Start time can be a set time, or the current time derived from an NTP server, as spe-
cified in your Network Configuration. If the current time is used, provided by an NTP
server, the scenario start will be delayed, in order to allow the simulation to load required
data, and start aligned to the nearest GPS minute.
The NTP (UTC) timescale is converted to the GPS timescale by a UTC-GPS offset defined
in the firmware.
For more information, see "Start Time" on page 40 .
Note: If this field is grayed out, it is not applicable for the chosen con-
figuration.
3.6.2.6 Ephemeris
If NTP start time is used, the Ephemeris cannot be downloaded, as this data is not available
in real time. The simulated range equals to (25.0E-3*speed_ of_ light), so the 1PPS Out
from the back panel would trail the time mark determined from the RF Out signal by 25
ms.
Note: If this field is grayed out, it is not applicable for the chosen con-
figuration.
3.6.2.7 AutoStart
If set to ON , AutoStart will start the Signal Generator mode automatically, once you
powered up the GSG unit.
If set to OFF , the signal generation is started by pressing the START key, and stopped by
pressing CANCEL . When a signal is generated, the simulated GPS time and the text Trans-
mission ON are displayed (see illustration below).
Note that Power and Frequency offset can be edited while the transmission is ON.
3.6 "Options" Menu
User Manual GSG-5/6 Series Rev. 27 97